# Test Edge infrastructure with MSTURNPING – Another beauty from the ResKit
It only runs on the Edge server
It needs the Edge Public cert to exist on the FE
If you have multiple Edge pools they will need to have access to each other
And of course they use internal DNS to look each other up

More Edge Stuff…

Make sure you can:-

Resolve the Lync server and DC on internal interface (via DNS or Hosts)

Getting the cert from the internal CA…Of course you can add the external cert to both edge interfaces as long as the Lync server trusts the issuing authority.

How to check Lync FE Certificates for CMS from Edge Server
Exported the certificate from the server hosting the CMS (without the private key)
Copy the file to the edge server (C:tmpCMSCert.cer).
From a command prompt run:-Certutil -verify -urlfetch “C:tmpCMSCert.cer” > c:\CRL.TXTThen I found that you can launch the CA management console and request the cert straight from there…awesome! (newbie…)

This command runs a check on the certificate (including accessing the CRLs) and dumps the results to a text file, it may take a few minutes to complete.